Knock party (4)

I believe the answer is:

bash

I believe this clue is a double definition.

'knock' is the first definition.
('bash' can be a synonym of 'knock')

'party' is the second definition.
(I've seen this before)

(Other definitions for bash that I've seen before include "Heavy blow; party" , "Batter" , "Shindig, function" , "Social event - clobber" , "Party; beat" .)

I've seen this clue in The Telegraph.

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